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Fair Value Disclosures (Details 1) (Level 2 [Member], USD $)
In Thousands, unless otherwise specified |
Mar. 31, 2014
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Dec. 31, 2013
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4.50% senior notes due two thousand eighteen [Member]
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| Fair value of fixed-rate debt | ||
| Aggregate Principal | $ 175,000 | $ 175,000 |
| Estimated Fair Value | 179,375 | 174,125 |
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7.15% senior notes due 2020 [Member]
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| Fair value of fixed-rate debt | ||
| Aggregate Principal | 300,000 | 300,000 |
| Estimated Fair Value | 334,500 | 325,500 |
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7.00% senior notes due 2022 [Member]
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| Fair value of fixed-rate debt | ||
| Aggregate Principal | 300,000 | 300,000 |
| Estimated Fair Value | 330,750 | 318,750 |
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1.875% convertible senior notes due 2032 [Member]
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| Fair value of fixed-rate debt | ||
| Aggregate Principal | 126,500 | 126,500 |
| Estimated Fair Value | $ 133,774 | $ 142,154 |
| X | ||||||||||
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- Definition
Face (par) amount of debt instrument at time of issuance. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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